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Accumulated Other Comprehensive Loss - Components (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | $ 29,534 | $ 30,428
Ending Balance | 34,046 | 29,534
Accumulated other comprehensive loss |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (11,995) | (12,593)
Change in period | 2,618 | 565
Tax effect of change in period | (71) | 33
Ending Balance | (9,448) | (11,995)
Effect of Foreign Currency Translation |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (4,696) | (5,111)
Change in period | 646 | 415
Ending Balance | (4,050) | (4,696)
Minimum Pension Liability |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (7,299) | (7,482)
Change in period | 1,972 | 150
Tax effect of change in period | (71) | 33
Ending Balance | $ (5,398) | $ (7,299)

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